Sheared stably stratified turbulence and large-scale waves in a lid driven cavity

N. Cohen, A. Eidelman, T. Elperin, N. Kleeorin, I. Rogachevskii

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


We study experimentally stably stratified sheared turbulence and large-scale flows and waves in a lid driven cavity with a non-zero vertical mean temperature gradient. Geometrical properties of the large-scale vortex (e.g., its size and form) and the level of small-scale turbulence inside the vortex are controlled by the buoyancy (i.e., by the temperature stratification). The observed velocity fluctuations are produced by the shear of the large-scale vortex. At larger stratification obtained in our experiments, the strong turbulence region is located at the upper part of the cavity where the large-scale vortex exists. In this region the Brunt-Väisälä frequency is small and increases in the direction outside the large-scale vortex. This is the reason of that the large-scale internal gravity waves are observed in the regions outside the large-scale vortex. We found these waves by analyzing the non-instantaneous correlation functions of the temperature and velocity fields. The observed large-scale waves are nonlinear because the frequency of the waves determined from the temperature field measurements is two times smaller than that obtained from the velocity field measurements. The measured intensity of the waves is of the order of the level of the temperature turbulent fluctuations.

Original languageEnglish
Title of host publicationProceedings of the 1st Thermal and Fluid Engineering Summer Conference, TFESC 2015
PublisherBegell House Inc.
Number of pages4
ISBN (Electronic)9781567004311
StatePublished - 1 Jan 2015
Event1st Thermal and Fluid Engineering Summer Conference, TFESC 2015 - New York City, United States
Duration: 9 Aug 201512 Aug 2015

Publication series

NameProceedings of the Thermal and Fluids Engineering Summer Conference
ISSN (Electronic)2379-1748


Conference1st Thermal and Fluid Engineering Summer Conference, TFESC 2015
Country/TerritoryUnited States
CityNew York City


  • Experimental study
  • Internal gravity waves
  • PIV
  • Stably stratified sheared turbulence

ASJC Scopus subject areas

  • Mechanical Engineering
  • Electrical and Electronic Engineering
  • Fluid Flow and Transfer Processes
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment


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